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I had a Lennox furnace installed last summer. The A/C cost…

Customer Question
I had a Lennox...

I had a Lennox furnace installed last summer. The A/C cost went down but the winter cost is about double that if the 40 year old unit I had replaced. I suspect that it is running entirely on auxiliary heat. How can I test this?

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

The thermostat is set for manual control at 72 deg. Filter is new.

Contractor's Assistant: Do you plan on doing the work yourself?

I don't trust the people that installed the system. They checked it out after I got a $500 electric bill and said the air filter was clogged. It was not -- you could see through it. I don't know who I will get to fix it. I am 82 years old and don't attempt this sort of task any more even though I am an electrical engineer.

Contractor's Assistant: Anything else we should know to help you best?

Is it possible to turn off the auxiliary heat? At least check the temperature when it should come on.

Submitted: 1 year ago.Category: HVAC
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Answered in 12 minutes by:
3/22/2017
HVAC Technician: Phil, Mechanical Engineer replied 1 year ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7,426
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello, your supposition about the system running on emergency heat is no doubt correct, to test that IF your heat pump unit sits outside the house, turn the power off to it. If the house still stays warm, its running on the emergency heat.

We can go from there

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